This paper presents an overview of a 3-year longitudinal study conducted by the National Institute of Child Health and Human Development (NICHD). The purpose of the study is to examine the concurrent, long-term, and cumulative influences of variations in early child care experiences on the cognitive, linguistic, social, emotional, and physical development of infants and toddlers. More than 1,300 full-term healthy infants and their families from 10 sites in various regions of the United States are included in the study, which began recruiting subjects in 1991 and will end data collection in 1995. Subjects are from urban and rural settings, and include minorities as well as members of single-parent and two-parent families. The NICHD study is expected to provide important empirical information that will be useful in the process of advocacy for chid care and the formulation of policy regarding child care. (MDM)

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